Because Gutterine (Earth) is still a very new member of the Galactic Empire - the ground forces and space fleet assigned to our planet is rather on the heavy side.
For any event in which Lord Vader or his Ominous Righteousness Emperor Sidious attend, massive displays of force are provided.
In the distance you can see Lord Vader's star destroyer, "Ænema". This is Lord Vader's personal Star Destroyer - fitted with the latest weaponry.